title: The influence of peripheral afferent signals on the rating of perceived exertion and time to exhaustion during exercise at different intensities.
abstract: This study determined which peripheral variables would better predict the rating of perceived exertion (RPE) and time to exhaustion (TE) during exercise at different intensities. Ten men performed exercises at first lactate threshold (LT1), second lactate threshold (LT2), 50% of the distance from LT1 to LT2 (TT(50%) ), and 25% of the distance from LT2 to maximal power output (TW(25%) ). Lactate, catecholamines, potassium, pH, glucose, V(·)O₂, VE, HR, respiratory rate (RR) and RPE were measured and plotted against the exercise duration for the slope calculation. Glucose, dopamine, and noradrenaline predicted RPE in TT(50%) (88%), LT2 (64%), and TW(25%) (77%), but no variable predicted RPE in LT1. RPE (55%), RPE+HR (86%), and RPE+RR (92% and 55%) predicted TE in LT1, TT(50%) , LT2, and TW(25%) , respectively. At intensities from TT(50%) to TW(25%) , variables associated with brain activity seem to explain most of the RPE slope, and RPE (+HR and+RR) seems to predict the TE.
authors.affiliation: School of Physical Education and Sport, University of São Paulo (USP), São Paulo, Brazil Sports Science Research Group, Federal University of Alagoas (UFAL), Maceió, Brazil. piresfo@usp.br
authors.forename: Flávio O
authors.initials: FO
authors.lastname: Pires
authors.forename: Adriano E
authors.initials: AE
authors.lastname: Lima-Silva
authors.forename: Rômulo
authors.initials: R
authors.lastname: Bertuzzi
authors.forename: Dulce H
authors.initials: DH
authors.lastname: Casarini
authors.forename: Maria Augusta P D M
authors.initials: MA
authors.lastname: Kiss
authors.forename: Mike I
authors.initials: MI
authors.lastname: Lambert
authors.forename: Timothy D
authors.initials: TD
authors.lastname: Noakes
mesh_terms: D000328:Adult; D000344:Afferent Pathways / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology*